Fitness Bike Features Hover over description to show feature image, click to enlarge Supersilent Poly-V Belt We replaced the common bicycle chain with a multi-ribbed, super-silent poly-v belt to create the quietest bike in the fitness industry. Contact Heart Rate Grips All Vision Fitness bikes come standard with Contact Hand Pulse Grips to accurately monitor your heart rate. ECB Motor-Operated Brake This electronically controlled resistance system uses six magnets and a heavy 21-pound flywheel to supply friction free resistance. COMFORT ARC™ Seat COMFORT ARC™ Seats provide the cushioning and support to allow the user to pedal for miles. Vision Fitness knows that if the exerciser is comfortable they will spend more time exercising and reach their fitness goals.